Karrueche Tran: Chris Brown's girlfriend who knows about his indiscretions?

Rumors have been flying recently that
Chris Brown and
Rihanna are back together, which - yikes. But TMZ
is reporting that Brown has a serious girlfriend, Karrueche Tran (above), and that the two of them are doing well together.

Sources close to Karrueche say that she is not perturbed by the rumors about Rihanna, because she is currently living with Chris Brown. Furthermore, after Brown made an appearance at Rihanna's birthday part, he whisked Karrueche off to Miami for Valentine's Day.

So ... we guess it's good that Rihanna did not go back to her abuser?

Meanwhile, US Weekly
has a source who tells them Karrueche knows that Chris Brown and Rihanna hook up (she thinks it happens at the studio), but she isn't going to t
hrow away her meal ticket
break up with her boyfriend over a few indiscretions.

And in case you were wondering, Karrueche is supposed an aspiring model - though judging by the pictures, she's about 5'3, so - good luck with that.